65197316549 has 2 divisors, whose sum is σ = 65197316550. Its totient is φ = 65197316548.

The previous prime is 65197316507. The next prime is 65197316581. The reversal of 65197316549 is 94561379156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63205479649 + 1991836900 = 251407^2 + 44630^2 .

It is a cyclic number.

It is not a de Polignac number, because 65197316549 - 2²⁰ = 65196267973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65197316494 and 65197316503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65197306549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32598658274 + 32598658275.

It is an arithmetic number, because the mean of its divisors is an integer number (32598658275).

Almost surely, 2^65197316549 is an apocalyptic number.

It is an amenable number.

65197316549 is a deficient number, since it is larger than the sum of its proper divisors (1).

65197316549 is an equidigital number, since it uses as much as digits as its factorization.

65197316549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6123600, while the sum is 56.

The spelling of 65197316549 in words is "sixty-five billion, one hundred ninety-seven million, three hundred sixteen thousand, five hundred forty-nine".